1. Bow care--Contact the bow maker and see what they suggest. Generally, self wood bows need to be kept dry. You don't say if yours is a self wood or composite. Also, see what the maker suggests as far as brace height and nock point, then experiment. Ask if they suggest shooting carbon arrows, as many traditional bows will not hold up to the light weight of carbons, and shooting carbons may void the warranty if the bow came with one.
2. Broadheads--I like Zwickey Black Diamonds in 2 blade 125 grain. They are tough, sharpen easily, and don't cost a fortune.
3. Get G. Fred Asbel's book on instinctive shooting, read it, practice the various methods and see what works best for you.
4. Arrows- Get the best straight, matched arrows you can afford. All other things equal, nothing will affect your accuracy like the quality of your arrows. Generally, longbows need a bit softer spined arrow so the arrow flexes enough to clear the bow face upon release, with minimal contact. Ask the bow maker what they suggest. Many things affect spine, such as arrow length, diameter and the weight of the tip. A friend starts with a 30" arrow and the tips he will be using, then cuts 1/2" off the arrow at a time to find the best arrow flight. You can get arrows with weight forward, footed shafts, and parallel or tapered. See what shoots best out of your bow.
Arrow wood- Good Port Orford cedar can make good arrows, but I found cedar did not hold up well, often breaking right behind the tip. If you are in Washington, I would look at Sitka Spruce of Douglas Fir, both of which are tough and can be made into great arrows. Google wood arrow shaft manufacturers and you will have many options.
5. Practice, practice, practice, and make sure you consistently do the same thing every time you draw and release an arrow. Most people cannot put the bow away for a week and pick it up a week later and immediately shoot as well as when they put the bow down. The experts shoot daily, and often practice even when they are hunting, during the course of the day.
6. Get a spare Flemmish twist string and set it up with a knock point and silencers, just like the one on the bow. Nothing will ruin a hunt faster than a broken string. Good luck and have fun.